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I don't think any authoritative work exists for Muscidae. As you know, an authoritative work contains keys AND genitalia. For example, The Plant- and Leafhoppers of Germany by Dr. Robert Biedermann and Dr. Rolf Niedringhaus. Also Blowflies of Fennoscandia and Denmark by Dr. Knut Rognes. I cannot find such works for Muscidae. Do you know of any? I'm surprised that noone has drawn genitalia for the Musca. I found drawings for Musca domestica only.

I still think that this should be Musca autumnalis. Overall it is a match but a few things make me feel uneasy about it. I'd like to have genitalia confirmed. I'm in the process of clearing it with KOH. Maybe I can write to a Muscidae expert if we cannot resolve this species.